code: def addusersitepackages(known_paths):
      """Add a per user site-package to sys.path
  
      Each user has its own python directory with site-packages in the
      home directory.
      """
      # get the per user site-package path
      # this call will also make sure USER_BASE and USER_SITE are set
      _trace("Processing user site-packages")
      user_site = getusersitepackages()
  
      if ENABLE_USER_SITE and os.path.isdir(user_site):
          addsitedir(user_site, known_paths)
      return known_paths
  
imports: import sys
  import os
  import builtins
  import _sitebuiltins
  import io
label_desc: Use image node_id 13 for calling a global function with example usage: addusersitepackages(known_paths) and returns: known_paths